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This kind of ulceration may cause due to deficiency of vitamin B complex. In your case if vitamin B complex capsule are not responding. But by homoeopathic treatment you can get rid of it completely and permanently. Foods that are good sources of vitamin B12 include:
ï§Beef, pork, ham, poultry, and lamb
ï§Fish, especially haddock, and tuna
ï§Milk, cheese, and yogurt
ï§Some nutritional yeast products
ï§Eggs.
Vegans consume no animal products. But they can take vitamin B12 dietary supplements to avoid deficiency.
Some types of soya milk and breakfast cereals are fortified with vitamin B12.
Some nutritional yeast products may contain vitamin B12.

Dear lybrate user, rinse your mouth with warm salt water 3-4 times daily to reduce the swelling. Take a pain killer if required. Avoid brushing hard in that area. Buy a soft toothbrush and save your teeth and gums by brushing gently using proper technique.

There are way to many causes for your problem. Few of them are use of various medications like antibiotics etc, diabetes, liver disorders, kidney disorders etc. If you are apparently normal and healthy individual, a more precise local cause can be present in your mouth that is accumulated plaque, calculus and/ or tongue coating. Age related degenerative changes another cause for your bitter taste. I would suggest you to meet a nearby dentist and let him find the cause. A better treatment can be done only after exact diagnosis of your problem. Meanwhile you can use Listerine or non alcohol based mouthwash to gurgle twice daily.
Thank you.

The white ulcers in the mouth cavity is due to gutka stop immediately only antibiotices will not help you avoid hot spicy food have a mouth full of saesame oil hold for some mins and spit do this twice a day cap becasules one daily
tab yastimadhu 1 twice a day one month
a biopsy of ulcer for histopathology is to be done if it does not heal.